"This is a scrolling shooter that was released on January 15, 2004, to play on Motorola T720, LGE VX4400, LGE VX4500, LGE VX6000 and Samsung SCH-A530, with original graphics. The game features 15 levels and its gameplay consists in killing all of the enemies until the end-level boss is reached. When the boss dies, it will drop a key card that will enable the access to the next level." Source: Wikipedia, "Duke Nukem Mobile", available under the CC-BY-SA License.